C#•12mo ago

Simplifying creation of inherited classes

class Entity {
    public string Field1 { get; set; }
    public string Field2 { get; set; }
    public string Field3 { get; set; }
    public int? FieldA { get; set; }
    public int? FieldB { get; set; }

}

class Base {
    public string Field1 { get; set; }
    public string Field2 { get; set; }
    public string Field3 { get; set; }
}

class A : Base {
    public int FieldA { get; set; }
}

class B : Base {
    public int FieldB { get; set; }
}

class Entity {
    public string Field1 { get; set; }
    public string Field2 { get; set; }
    public string Field3 { get; set; }
    public int? FieldA { get; set; }
    public int? FieldB { get; set; }

}

class Base {
    public string Field1 { get; set; }
    public string Field2 { get; set; }
    public string Field3 { get; set; }
}

class A : Base {
    public int FieldA { get; set; }
}

class B : Base {
    public int FieldB { get; set; }
}

Entity entity = GetEntityFromDatabase();
if (entity.Field1 == "A") {
    return new A {
        Field1 = entity.Field1,
        Field2 = entity.Field2,
        Field3 = entity.Field3,
        FieldA = entity.FieldA.Value
    };
} else if (entity.Field2 == "B") {
    return new B {
        Field1 = entity.Field1,
        Field2 = entity.Field2,
        Field3 = entity.Field3,
        FieldB = entity.FieldB.Value
    };
}

Entity entity = GetEntityFromDatabase();
if (entity.Field1 == "A") {
    return new A {
        Field1 = entity.Field1,
        Field2 = entity.Field2,
        Field3 = entity.Field3,
        FieldA = entity.FieldA.Value
    };
} else if (entity.Field2 == "B") {
    return new B {
        Field1 = entity.Field1,
        Field2 = entity.Field2,
        Field3 = entity.Field3,
        FieldB = entity.FieldB.Value
    };
}

Basically we need to fetch Entity from the database and then map it into A or B depending on a field. That means you'll have to repeat the field copies a lot. With more fields and more "A"-"B"-"C"-"D"s... this will become a nightmare to maintain. Any other ideas?

2 Replies

UltraWelfareOP•12mo ago

I guess the only solution is to use an automatic mapper or just copy the fields over and over again 🥲

Anu6is•12mo ago

Are you using an ORM? EF Core should be able to handle this with discriminators

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Simplifying creation of inherited classes